Photocatalytic properties of TiO2 modified with platinum and silver nanoparticles in the degradation of oxalic acid in aqueous solution

Iliev, V.; Tomova, D.; Bilyarska, L.; Eliyas, A.; Petrov, L.

doi:10.1016/j.apcatb.2005.10.014

Cited by 207 publications

(123 citation statements)

References 30 publications

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“…In this respect, the addition of some noble metals to TiO 2 has been shown to be favorable. [35,38,41,42] However, for applications that involve antibacterial effects, more work was devoted to Ag-doping by photodeposition of silver on TiO 2 from AgNO 3 solutions or by sol-gel processes. [21][22][23] The higher photocatalytic and bactericidal effects of these coatings with regard to pure TiO 2 have been discussed in terms of a more efficient separation of TiO 2 charge carriers (because of the reduction of silver ions).…”

Section: Microstructure Effects On Bactericidity and Cell Biotoxicitymentioning

confidence: 99%

Versatile Nanocomposite Coatings with Tunable Cell Adhesion and Bactericidity

Fischer-Brandies¹,

Es‐Souni²

2008

Adv Funct Materials

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TiO2‐Ag nanocomposites are known for their bactericidal effect during exposure to appropriate UV radiation. While involving hazardous radiation, and limited to accessible areas, the bactericidity of these coatings is not persistent in the absence of UV light, which impedes their commercial application. Herein it is shown that TiO2‐Ag nanocomposites can be made highly bactericidal without the need of irradiation. Beyond this, bactericidity can even be mitigated in the presence of pre‐irradiated coatings. Biocompatibility and cell adhesion are also negligibly small for the as‐processed, non‐irradiated coatings, and become fairly high when the coatings are irradiated prior to testing. This opens the possibility to pattern the coatings into areas with high and low cell adhesion properties. Indeed by irradiating the coating through a mechanical mask it is shown that fibroblast cell adherence is sharply confined to the irradiated area. These properties are achieved using TiO2‐Ag thin films with high silver loadings of 50 wt%. The films are processed on stainless steel substrates using solution deposition. Microstructural characterization by means of X‐ray diffraction, Raman, and X‐ray photoelectron spectroscopy, high‐resolution scanning electron microscopy, and atomic force microscopy show a highly amorphous TiO2‐AgxO nanocomposite matrix with scattered silver nanoparticles. UV irradiation of the films results in the precipitation of a high density of silver nanoparticles at the film surface. Bactericidal properties of the films are tested on α‐haemolyzing streptococci and in‐vitro biocompatibility is assessed on primary human fibroblast cultures. The results mentioned above as to the tunable bactericidity and biocompatibility of the TiO2‐Ag coatings developed herein, are amenable to silver ion release, to catalytic effects of silver nanoparticles, and to specific wettabilities of the surfaces.

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Section: Microstructure Effects On Bactericidity and Cell Biotoxicitymentioning

confidence: 99%

Versatile Nanocomposite Coatings with Tunable Cell Adhesion and Bactericidity

Fischer-Brandies¹,

Es‐Souni²

2008

Adv Funct Materials

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“…Silver can trap the excited electrons from titanium dioxide and leave the holes for the degradation reaction of organic species. It also results in the extension of their wavelength response towards the visible region [3]. In addition, silver nanoparticles possess the ability to absorb visible light, due to localized surface plasmon resonance (LSPR) [4].…”

Section: Introductionmentioning

confidence: 99%

Silver-doped TiO2 prepared by microemulsion method: Surface properties, bio- and photoactivity

Zielińska

Kowalska

Sobczak

et al. 2010

Separation and Purification Technology

184

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A series of Ag-TiO 2 photocatalysts were obtained in microemulsion system (water/AOT/cyclohexane), using several Ag precursor amount ranging from 1.5 to 8.5 mol.%. The photocatalysts' characteristics by X-ray diffraction, STEM microscopy, UV-Vis spectroscopy, X-ray photoelectron spectroscopy, BET methods showed that a sample with the highest photo-and bioactivity had anatase structure, about 90 m 2 /g specific surface area, absorbed light for λ>400 nm and contained 1.64 at.% of silver (0.30 at.% of Ag 0 and 1.34 at.% of Ag 2 O) and about 13 at.% of carbon in the surface layer.The photocatalytic activity of the catalysts was estimated by measuring the decomposition rate of phenol in 0.21 mM aqueous solution under visible and ultraviolet light irradiation.The bioactivity of silver-doped titanium dioxide nanocomposites was estimated using

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“…The photocatalytic mechanism involves 42 the excitation of valence electrons to the conduction band by 43 absorbing the UV light, resulting in the formation of holes in 44 the valence band [16]. These electrons and holes can undergo 45 subsequent reduction and oxidation before the recombination 46 reaction.…”

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confidence: 99%